نتایج جستجو برای: galaxies size

تعداد نتایج: 599707  

Journal: :Monthly Notices of the Royal Astronomical Society 2007

Journal: :Monthly Notices of the Royal Astronomical Society 2016

Journal: :Monthly Notices of the Royal Astronomical Society 2003

2009
Hirohito Hayashi Masashi Chiba

We investigate the dynamical effects of dark matter subhalos on the structure and evolution of a galactic disk, using semi-analytic method that includes approximated and empirical relations as achieved in detailed numerical simulations of the cold dark matter model. We calculate the upper limit for the size of a galactic disk at a specific redshift z, based on the orbital properties of subhalos...

2009
DAVID MERRITT JEREMY D. SCHNITTMAN

A supermassive black hole ejected from the center of a galaxy by gravitational wave recoil carries a retinue of bound stars – a “hypercompact stellar system” (HCSS). The numbers and properties of HCSSs contain information about the merger histories of galaxies, the late evolution of binary black holes, and the distribution of gravitational-wave kicks. We relate the structural properties (size, ...

2009
Thorsten Naab Peter H. Johansson Jeremiah P. Ostriker

Using a high resolution hydrodynamical cosmological simulation of the formation of a massive spheroidal galaxy we show that elliptical galaxies can be very compact and massive at high redshift in agreement with recent observations. Accretion of stripped in-falling stellar material increases the size of the system with time and the central concentration is reduced by dynamical friction of the su...

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